`I50.21` Acute systolic (congestive) heart failure

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

heart failure complicating abortion or ectopic or molar pregnancy (O00-O07, O08.8)
heart failure due to hypertension (I11.0)
heart failure due to hypertension with chronic kidney disease (I13.-)
heart failure following surgery (I97.13-)
obstetric surgery and procedures (O75.4)
rheumatic heart failure (I09.81)

combined systolic (congestive) and diastolic (congestive) heart failure (I50.4-)

Risk adjustment (HCC)

Defines the logic of DRG(s) 291-293 in MDC 05.

Code Also: I50.814 Right heart failure due to left heart failure ("the type of left ventricular failure, if known (I50.2-I50.43)")
Code Also: I50.82 Biventricular heart failure ("the type of left ventricular failure as systolic, diastolic, or combined, if known (I50.2-I50.43)")
Code Also: I50.84 End stage heart failure ("the type of heart failure as systolic, diastolic, or combined, if known (I50.2-I50.43)")

Code Also: E83.820 Generalized arterial calcification of infancy with unspecified genetic causality ("heart failure (I50.-)")
Code Also: E83.821 ENPP1 deficiency causing generalized arterial calcification of infancy ("heart failure (I50.-)")
Code Also: E83.823 ABCC6 deficiency causing generalized arterial calcification of infancy ("heart failure (I50.-)")
Use Additional: I09.81 Rheumatic heart failure ("code to identify type of heart failure (I50.-)")
Use Additional: I11.0 Hypertensive heart disease with heart failure ("code to identify type of heart failure (I50.-)")
Use Additional: I13.0 Hypertensive heart and chronic kidney disease with heart failure and stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease ("code to identify type of heart failure (I50.-)")
Use Additional: I13.2 Hypertensive heart and chronic kidney disease with heart failure and with stage 5 chronic kidney disease, or end stage renal disease ("code to identify type of heart failure (I50.-)")
Use Additional: I16.1 Hypertensive emergency ("acute pulmonary edema (left and/or right ventricular failure) (J81.0, I50.-)")
Code First: I5A Non-ischemic myocardial injury (non-traumatic) ("heart failure (I50.-)")
Use Additional: I97.13 Postprocedural heart failure ("code to identify the heart failure (I50.-)")
Type 2 Excludes: J91 Pleural effusion in conditions classified elsewhere ("pleural effusion in heart failure (I50.-)")

Failure, failed › Note: heart failure stages A, B, C, and D are based on the American College of Cardiology and American Heart Association stages of heart failure, which complement and should not be confused with the New York Heart Association Classification of Heart Failure, into Class I, Class II, Class III, and Class IV › systolic (congestive) (left ventricular) › acute (congestive)